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The elbow is a complex joint that allows for flexion, extension, and rotation of the forearm. This movement is made possible by the many muscles that cross over or attach to the elbow joint. These muscles also play a crucial role in stabilising the elbow, protecting it from various forces and preventing injuries. The elbow joint is also supported by ligaments and tendons, which provide additional stability. Tendons, in particular, connect the bones and muscles that meet at the elbow, but they can be worn and torn with repetitive use.
| Characteristics | Values |
|---|---|
| Elbow Joint | Synovial hinge joint |
| Elbow Joint Bones | Humerus, Ulna, Radius |
| Elbow Joint Ligaments | Medial Collateral Ligament (MCL), Lateral Collateral Ligament (LCL) |
| Elbow Joint Muscles | Biceps Brachii, Brachialis, Brachioradialis, Triceps Brachii, Anconeus, Pronator Teres, Supinator |
| Elbow Joint Tendons | Biceps Tendon, Triceps Tendon |
| Elbow Joint Injuries | Lateral Epicondylitis (Tennis Elbow) |
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What You'll Learn
The biceps brachii muscle
The biceps brachii tendon originates at the supraglenoid tubercle and superior glenoid labrum. The long head's labral origin is mostly posterior in most individuals, while the tendon is 9 cm long on average. The biceps long head tendon then exits the distal bicipital groove and joins the short head tendon. Both tendons transition into their respective muscle bellies in the central third of the upper arm. After crossing the cubital fossa, the biceps brachii continues as the bicipital aponeurosis, which inserts on the radial tuberosity and medial forearm fascia.
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Elbow ligaments and tendons
The elbow joint is a complex structure that allows for hinge and pivot movements. It is made up of articulations between the distal humerus, proximal ulna, proximal radius, and the humerus. The elbow joint is supported by various ligaments and tendons, which provide stability and facilitate movement.
Ligaments are strong, rope-like tissues that connect bones together and help hold tendons in place. The elbow contains several ligaments that provide stability to the joint:
- Medial Collateral Ligament (MCL): The MCL is a triangular-shaped ligament composed of three smaller ligaments—the anterior oblique ligament, posterior oblique ligament, and transverse ligament. It connects the inside edge of the humerus to the ulna and acts as the primary stabilizer of the elbow joint, protecting against excessive valgus forces.
- Lateral Collateral Ligament (LCL): The LCL is also composed of three parts—the annular ligament, lateral radial collateral ligament, and lateral ulnar collateral ligament. It connects the outside edge of the humerus to the ulna and provides stability during varus stresses and posterolateral rotational movements.
Tendons are soft tissues that connect muscles to bones, providing support and facilitating movement. Several tendons are associated with the elbow joint:
- Biceps Tendon: This tendon connects the biceps muscle on the front of the arm to the radius bone, allowing for supination (rotation) of the elbow.
- Triceps Tendon: The triceps tendon attaches the triceps muscle on the back of the arm to the ulna bone, enabling elbow extension or straightening of the elbow.
- Forearm Muscles: Tendons in this area connect the forearm muscles to the lateral and medial epicondyles, facilitating extension and flexion of the hand and wrist.
The elbow joint is surrounded by a synovial membrane, which contains lubricating synovial fluid, reducing friction during movement. The complex interplay of ligaments, tendons, muscles, and bones allows for the elbow's range of motion and stability.
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Elbow flexors and extensors
The elbow is a complex joint, allowing for flexion and extension of the forearm, as well as rotation of the wrist. Elbow muscles are often referred to as flexors or extensors, depending on how they affect elbow movement. Extensors are on the inside of the arm and help extend the arm outward, while flexors are at the back of the elbow and pull it closer to the elbow by bending the joint.
The primary flexor muscle of the elbow is the brachialis, which is found in the upper arm between the humerus and ulna. The long biceps brachii muscle is superficial to the brachialis and functions as a flexor at the elbow, as well as enabling supination of the forearm and turning the palm of the hand anteriorly. The third flexor muscle is the brachioradialis, which is found in the forearm but runs from the distal end of the humerus to the radius.
The extensors of the forearm are the triceps brachii and the anconeus. The triceps brachii is a long muscle that runs from the scapula to the olecranon of the ulna. The anconeus is much smaller and begins at the distal end of the humerus, ending at the olecranon.
In addition to these primary flexors and extensors, several other muscles cross over or attach to the elbow joint, contributing to its stability and enabling wrist and finger movement. These include the flexor digitorum superficialis, flexor carpi ulnaris, flexor carpi radialis, and pronator teres, which act as flexors, and the extensor digitorum communis, extensor carpi radialis brevis and longus, and extensor carpi ulnaris, which act as extensors.
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Elbow joint structure
The elbow joint is a complex synovial hinge joint, which may be the most complex joint in the human body. It is made up of articulations of mainly the distal humerus and the proximal ulna. However, articulations also exist between the proximal radius and the humerus, as well as the proximal radius and ulna. These three articulations are referred to as the ulnohumeral, radiohumeral, and proximal radioulnar joints, respectively.
The elbow joint is supported by ligaments, tendons, cartilage, muscles, nerves, and blood vessels. The elbow joint connects three bones: the humerus in the upper arm, and the radius and ulna in the lower arm. The elbow is the joint that connects the upper arm to the forearm. The elbow joint serves as a crossing for most of the neurovasculature in the upper extremity. The elbow joint is innervated by branches of the medial, musculocutaneous, radial, and ulnar nerves.
The elbow joint has a capsule enclosing the joint. This is strong and fibrous, strengthening the joint. The joint capsule is thickened medially and laterally to form the medial and lateral collateral ligaments (MCL and LCL), which stabilise the flexing and extending motion of the arm. The MCL is triangular and made up of three smaller ligaments: the anterior oblique ligament, the posterior oblique ligament, and the transverse ligament. The LCL is composed of three parts: the annular ligament, the lateral radial collateral ligament, and the lateral ulnar collateral ligament.
The elbow joint is surrounded by a watertight sac called a joint capsule, which contains lubricating synovial fluid. The elbow joint also has many bursae, which are sac-like structures containing a small amount of synovial fluid that functions to decrease friction between tendons, bone, and skin during movement.
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Forearm muscles
The elbow joint is a complex structure formed by the articulation of the humerus in the upper arm with the ulna and radius in the forearm. This joint allows for flexion and extension of the forearm, as well as rotation of the wrist. While the elbow itself is non-weight bearing, it is the second most commonly injured joint in sports-related injuries.
The muscles of the forearm play a crucial role in these movements, and they can be broadly classified into two groups: the flexor group and the extensor group. The flexor group includes muscles such as the flexor carpi radialis, flexor carpi ulnaris, palmaris longus, and flexor digitorum superficialis. These muscles originate from the medial epicondyle of the humerus and run along the anterior forearm to the palm of the hand and fingers. When contracted, they bend the wrist and fingers, pulling the hand closer to the body.
The extensor group includes muscles like the extensor digitorum communis, extensor carpi radialis brevis, and longus, which straighten the wrist and fingers, moving the hand away from the body. These muscles originate from the lateral epicondyle of the humerus and run along the posterior forearm.
Additionally, two specific muscles, the pronator teres and the supinator, are responsible for rotating the forearm. The pronator teres enables medial rotation, causing the palm to face the body's posterior, while the supinator allows lateral rotation, turning the palm to face anteriorly.
It is important to note that improper use of the forearm muscles, such as repetitive strenuous contractions or lifting heavy items with arms extended, can lead to injuries and conditions like lateral epicondylitis ("tennis elbow") or Volkmann contracture, which causes a "claw-like" posture in the hand, wrist, and fingers.
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Frequently asked questions
The elbow is a complex joint that permits flexion and extension of the forearm. The primary flexor of the elbow is the brachialis, which is found in the upper arm between the humerus and ulna. The long biceps brachii muscle is superficial to the brachialis and functions as a flexor at the elbow. The brachioradialis is the third flexor muscle of the elbow. The extensors of the forearm are the triceps brachii and anconeus. Other muscles that cross the elbow include the pronator teres and the supinator, which enable the rotation of the forearm.
The elbow is the second most commonly injured joint in sports-related injuries. One common injury is lateral epicondylitis, also known as "tennis elbow", which is soreness of the forearm extensor muscles attached to the lateral epicondyle of the humerus. This is caused by repetitive strenuous contraction of the muscles, such as hitting many backhand strokes in tennis. Tendon tears can also occur due to repetitive stressful use, with muscles and tendons strained by improper lifting.
The elbow joint is made up of articulations of the humerus, ulna, and radius. The elbow joint is surrounded by a joint capsule that contains lubricating synovial fluid. The elbow joint also has ligaments that provide stability, such as the medial collateral ligament (MCL) and the lateral collateral ligament (LCL).
